Lead Application Developer - Back-End (m/f/d)
deutschetelekomitsolutionsslovakia
Košice, Košický kraj, Slovakia (Slovak Republic) · Košice · Slovakia
Posted May 29, 2026
- Full-time
- Hybrid
- Telekom IT Slovakia
- Mid-Senior Level
deutschetelekomitsolutionsslovakia
Košice, Košický kraj, Slovakia (Slovak Republic) · Košice · Slovakia
Posted May 29, 2026
Company Description Our brand Deutsche Telekom IT Solutions Slovakia entered the life of Košice region in 2006 under the name of T-Systems Slovakia and ever since has been inextricably linked with the region when became one of the founding members of Košice IT Valley. We have managed to grow from scratch to the second largest employer in the eastern part of the country with more than 3900 employees. Our goal is to proactively find new ways to improve and continuously transform into the type of company providing innovative information and communication technology services. Job Description Our mission: As a dynamic, flat and international organization, we shape the future of Deutsche Telekom IT in integrated teams consisting of all relevant competencies – it goes without saying that Telekom customers are also part of these teams. Our Focus: Architectural Evolution: We're dedicated to transitioning from monolithic systems to a decoupled API architecture, improving efficiency, reliability, and enabling scalability. Cloud Transition: Our work involves utilizing top-tier cloud solutions including AWS, Azure, and Google Cloud, as well as our private cloud for sensitive data. We're in the process of migrating from on-premise setups to a more robust, scalable cloud infrastructure. Cutting-Edge Technology: We stay on the forefront of the tech industry by actively employing modern technologies, fostering an environment that encourages learning and professional growth. Agile Collaboration: We believe in the power of teamwork and adaptability. By implementing the Scrum methodology and SAFe in our biggest projects, we ensure dynamic collaboration and efficient workflow across all levels of our organization. Innovation & Value Creation: Our teams are constantly pushing the boundaries, redesigning current solutions to fit contemporary standards, and embarking on greenfield projects with high business potential. Through strategic prototyping, we continuously unearth fresh ideas and cultivate a culture of constant innovation. Lead Application Developer handles all phases of software development lifecycle by himself, provides professional support in the field of deep system analysis, technical documentation, building related infrastructure for developed application by prototyping, research, performs role of lead development architect, substitutes the role of project manager in case of small or midsize software projects, serves as professional mentor. Holder of the position discuss and aid the Product owners or Product managers to make sure that the development team and technologies being selected are aligned with the business' goals and vision of the company and product. Lead Application Developer is responsible for technical project management within planning phases. WHAT WILL YOU DO ? Develop new and maintain existing source code of applications Works in SCRUM team on developing and building complex application solutions for customer DTAG Serve as professional mentor for junior, medior, senior developers Listen to user requests, consult with internal /external customers, project managers, Analyze of customer’s requirements and propose overall application / framework design of midsize application architecture, provide complex business analysis in order to build application functionality Provides project estimates, timeline and bug fixing and report it to customer for budget planning in advance Implements customer’s requirements based on specification in selected object-oriented programming language into functional and user-friendly application Provides testing of programmed functionality before deployment to avoid bugs and ensure quality of code Implements security concept according to PSA policy in developed application to ensure accordance with DTAG standards Mentoring Take part on internal evaluation processes Product responsibility from technology point of view. Negation with PO/PM about technology stacks used in project. Qualifications YOU WILL SUCCEED IF YOU : Have Master Degree of Information Technologies Have minimum 7 years experience at ICT Systems Engineering Have any experience in Senior Application development position. Hold certificate in Technology stack which is used by concrete person (for example Java – OCP, .Net – MCSA) Are expert in programming Have overview of HW/SW and General IT Skills Are advanced at Soft skills such as Communication, Team Cooperation, Mentoring, Product management Speak English at least on B2 level Other criteria or requirements Experience in Senior Application development position Tech Stack For our projects, we are searching for developers within preferred stacks (Front end, Back end or Full stack): • Tech. stack 1: Java, Spring Boot • Tech. stack 2: Angular, React, VueJS • Tech. stack 3: C# Additional preferred knowledge/experience (as an advantage): any testing tool/framework, Kubernetes, Docker, Microservices, Git, cloud technologies (AWS, Azure, Google), DB Additional Information WHY SHOULD YOU CHOOSE US? We believe in balance between work and personal life. An attractive and extensive work-life balance portfolio guarantees lasting motivation for employees and thus a better quality of life, promotes physical and mental well-being and contributes to a positive work environment. All this with the aim of providing more freedom in reconciling work, career growth, private life and individual lifestyle. Therefore we offer to our employees over 25 different benefits to improve their personal and professional life in these areas: Financial benefits Benefits with focus on learning and development Benefits with focus on health and sport Benefits with focus on family and work – life balance Other benefits For more information about our benefits click to Benefits Salary Final salary is negotiable. We are offering base salary depending on seniority level and previous experience of candidate. In addition to base salary we provide variable part and other financial benefits. Base salary will not be lower than 4100 € /gross. Additional information * Please be informed that our remote working possibility is only available within Slovakia due to European taxation regulation.